Mac Mail stopped working ?

[Washac]

Up until the beggining of last week Mac Mail was working fine then on Wednesday it all came to a halt with an error triangle icon. I had had this before but in the past it had fixed itself, this time it didn't so at the weekend I started investigating and found that I could get incoming mail using Thunderbord but no outgoingwas working, main error being. . . Unable to verify account name or password.

I have tried Thunderbird and Postbox with the same result, I contacted my Mail supplier who said firstly make sure that you use the latest version of Mac OS that you can, same problem in Catalina. I can connect to Webmail, then my provider tells me that Cpanel upgraded there software last week to make it more secure, more secure indeed, I for one cannot get a connection, seems from what I found out they are not shaking hands therefore no connection.

Mac Mail nothing works, Thunderbird incoming mail only, Postbox nothing works.

 

[BrianBaughn]

To get help here you probably need to reveal the email provider. Perhaps someone has a similar setup.

 

[Washac]

To get help here you probably need to reveal the email provider. Perhaps someone has a similar setup.

I can but it is a small UK provider and I doubt very very much if anybody here will have them as their provider.

 

[BrianBaughn]

I can but it is a small UK provider and I doubt very very much if anybody here will have them as their provider.

Ah…but small providers usually use a pre-configured system and it is likely a common one.

 

[Unsupported]

I can connect to Webmail, then my provider tells me that Cpanel upgraded there software last week to make it more secure, more secure indeed, I for one cannot get a connection, seems from what I found out they are not shaking hands therefore no connection.

Mac Mail nothing works, Thunderbird incoming mail only, Postbox nothing works.

What OS are you on?

I had a similar problem a few years ago when my domain host upgraded its TLS implementation. My older OS at the time, with its older version of Mail wouldn't "shake hands".

I'd guess you have a similar problem.

Does Apple Mail 9.3 support TLS 1.2 ? - Apple Community

discussions.apple.com

This from my hosting company, 2019:

we changed the mailserver setting to SSL3.

It is also important that you upgrade your email client since tlsv1 is no longer supported and has major security holes.

thanks
Sam